ACEBOTT Large Capacitive Touch 4*4 Matrix Keypad ModuleEasy-Plug

1.Product Introduction

The 4×4 touch keyboard module is an input device used to input data into a computer or other electronic device. Each key of this keyboard is a capacitive touch design, with a layout of four rows and four columns, and each key represents a specific character. When a finger touches a key, it causes a corresponding change in the capacitance of the touch key. Once the detection circuit connected to the key detects this capacitance change, it outputs information that the corresponding key has been pressed.

Application reference: password doors, calculators, ATM machines, mobile phones, etc.

2.Parameter Specification

3.Wiring Diagram

4.Sample Code

 1#include <ACB_KeyBoard_I2C.h>
 2ACB_KeyBoard_I2C kb;//Create a touch keyboard object
 3
 4void setup() {
 5
 6  Serial.begin(115200);
 7}
 8
 9void loop() {
10    char customKey = kb.getKey();//Get the value of a key
11    if(customKey){ //Waiting for a key touch
12      Serial.print(customKey);
13      delay(500);
14    }
15    
16  }
17
18

5.Test Result

After you have successfully connected the circuit according to the wiring diagram and successfully uploaded the correct program, when you touch and press a key, the serial port monitor will print the corresponding key value.

6.Related Resources

PDF and Code

7.Get One Now

B2B Business: info@acebott.com

1.Product Introduction

The 4×4 touch keyboard module is an input device used to input data into a computer or other electronic device. Each key of this keyboard is a capacitive touch design, with a layout of four rows and four columns, and each key represents a specific character. When a finger touches a key, it causes a corresponding change in the capacitance of the touch key. Once the detection circuit connected to the key detects this capacitance change, it outputs information that the corresponding key has been pressed.

Application reference: password doors, calculators, ATM machines, mobile phones, etc.

2.Parameter Specification

Parameter	Value//Description
Operating voltage	3.3V~5V
Operating temperature	-40°C~+85°C
Communication method	I2C
Size	5.6cm*7.8cm

3.Wiring Diagram

Hint

Expansion board is attached to esp32 controller board.

4×4Touch Keyboard	ESP32
SCL	SCL
SDA	SDA
VCC	5V
GND	GND

4.Sample Code

 1#include <ACB_KeyBoard_I2C.h>
 2ACB_KeyBoard_I2C kb;//Create a touch keyboard object
 3
 4void setup() {
 5
 6  Serial.begin(115200);
 7}
 8
 9void loop() {
10    char customKey = kb.getKey();//Get the value of a key
11    if(customKey){ //Waiting for a key touch
12      Serial.print(customKey);
13      delay(500);
14    }
15    
16  }
17
18

5.Test Result

After you have successfully connected the circuit according to the wiring diagram and successfully uploaded the correct program, when you touch and press a key, the serial port monitor will print the corresponding key value.

6.Related Resources

PDF and Code